Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 9
·3292-3299
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IF 6.4
Yongjie Zhang,Yu-Ming Sun,Gonghui Li,Meiyan Du,Ning Sheng,Jinglin Shen
The photoluminescence properties of fluorescent hydrogels are strongly influenced by the supramolecular organization of the chromophores, which makes their modulation nontrivial. In this work, a series of fluorescent hydrogels with different emission colors were prepared by co-assembly of organic dyes with an amphiphilic peptide gelator. Depending on the two distinct gelation states of the peptide, the obtained fluorescent hydrogels exhibited different emission properties. The hydrogels prepared at lower alkalinity (Gel 1) could enhance the emission of the doped dyes that carry cationic groups (namely rhodamine B and sulforhodamine B), while those prepared at higher alkalinity (Gel 2) caused the emission quenching of the dyes. Based on the structural characterization of two types of hydrogels, it is speculated that nanowire aggregates in Gel 1 function as a template to direct the organization of co-assembled dye molecules through electrostatic interactions, and the emission is enhanced due to the restriction of molecular motion. In contrast, the less organized aggregates in Gel 2 allow the dye molecules to self-assemble through π–π stacking which leads to emission quenching. Due to the homochirality of the amino acid residues in peptide gelators, the aggregates of Gel 1 exhibit supramolecular chirality which is confirmed by CD spectroscopy. Consequently, optical activities including CD activity and CPL properties were also observed for the fluorescent hydrogels based on the Gel 1 matrix, and they originated from the chiral arrangement of dye molecules directed by the ordered anionic L-serine residues on the periphery of nanowires.
研究领域:
材料科学
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光学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Qianfen Zhuang,Chao Zeng,Yaxin Mu,Tao Zhang,Guotao Yi,Yong Wang
Developing a rapid, efficient, sensitive and selective nabam sensor is essential due to its potential effect on human toxicity and environmental risk. In the report, a fast, ultrasensitive and highly selective sensor for the detection of nabam—disodium ethylenebis(dithiocarbamate) is developed using lead(II)-triggered photoluminescent aggregated gold nanoclusters (AuPbNCs) as probes. The AuPbNCs are synthesized using chloroauric acid, lead(II) acetate basic, and adenosine as the precursors. Detailed characterizations confirm that during the synthesis process of AuPbNCs, lead(II) precursor not only acts as a coupling agent to induce the aggregation of nanoclusters, but also serves as a dopant into nanoclusters. Relative to the photoluminescent adenosine-stabilized gold nanoclusters (AuNCs), AuPbNCs exhibit emission enhancement behavior, ascribing to the structural rigidification and heavy-atom effect of lead. Nabam induces photoluminescence quenching of AuPbNCs, and the quenching process is predominately attributed to static photoinduced electron transfer. A linear relationship with two segments between the photoluminescence quenching ratio of AuPbNCs and nabam concentrations ranging from 0.05 to 25 nM is established, and the detection limit of 20 pM is achieved on the basis of a signal-to-noise (S/N) ratio of 3. Compared with the AuNCs, the highly photoluminescent AuPbNCs exhibit enhanced sensitivity and selectivity for nabam detection. The interaction study between nabam and AuPbNCs reveals that when the added nabam concentration increases, AuPbNCs undergo a process, from aggregation to disaggregation, and then to reaggregation, due to the complexation between nabam and lead or gold of the AuPbNCs. Moreover, the AuPbNCs-based sensor is successfully tested for the nabam detection in real samples (lake water and wheat) and test papers.
研究领域:
分析化学
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环境科学
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2015
·Vol. 15
·期 7
·5087-5092
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IF 1.556
Zhao Yanmeng,Zhang Zhongping,Sun Dapeng,Li Guangqiang,Lan Xinzheng,Jiang Yang
We explored a facile routine to synthesize morphology-controlled Ag2S–CdS heterostructures. The heterostructures were achieved by a two-step method where CdS nanorods were prepared in the first step, acting as the substrates inducing successive cation exchange reaction
between Cd2+ and Ag+ ion. The nucleation sites of Ag2S can be readily controlled by varying the feed ratios of Ag+ to Cd2+ ion, thus leading to formation of heterostructures with different morphology where Ag2S particles grow
on the tips of the CdS rods, or at multiple locations across the nanorods. HRTEM analysis showed that Ag2S particles were grown on the varied sites of CdS rods with a coherent, quasi-epitaxial interface having different degrees of lattice mismatch. Photoluminescence results showed
that, compared to bare CdS nanorods, enhanced trap emissions were observed after the growth of Ag2S particles on the rods, which can be attributed to the strained interfaces instead of impurities doping.
研究领域:
材料科学
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光学
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纳米技术
✓ 已验证
DOI
PubMed
高影响因子
RSC Advances
·
2020
·Vol. 10
·期 53
·31705-31710
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IF 3.119
Hongcheng Yang,Miao Zhou,Haodong Tang,Mingyu Sun,Pai Liu,Yizun Liu,Lixuan Chen,Dongze Li,Dan Wu,Junjie Hao,Bing Xu,Zhili Zhao,Zhenwei Ren,Siqi Jia,Kai Wang,Xiao Wei Sun
Quantum dots (QDs) have received considerable attention in information displays owing to their high quantum yield, high colour purity and low-cost fabrication. However, light emission for ultra-thin QD films with low mass percentage of QDs still need to be improved because the blue light can directly transmit the films, leading to insufficient energy to excite the QDs. In this study, we report QD films based on a poly(zinc methacrylate) coating with alloyed green-emitting CdZnSeS/ZnS quantum dots (QDs@PZnMA) together with high refractive-index BaTiO3 nanoparticles to enhance the scattering coefficient of the QD films. Results demonstrate a 7.5-fold increase in the absorption coefficient, 11.3-fold increase in the scattering coefficient, 8.5-fold increase in the optical density (OD) and 8.6-fold increase in the green-light emission of QD films, compared with films that have the same mass percentage of pristine QDs. This approach provides a promising strategy for developing QD optical films with high scattering and enhanced light emission for flexible displays.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 76
·48238-48244
·
IF 3.108
Jiangyun Dai,Chao Yang,Hong Zhang,Hua Zhang,Guoying Feng,Shouhuan Zhou
The successful synthesis of rare earth doped nano/microcrystals with the desired morphology, uniform monodispersity, and intense infrared emission is of fundamental significance, and would facilitate their application in infrared emission-related miniaturization and integration in optoelectronics. However, simultaneously controlling the morphology and enhancing the infrared emission through simple and effective methods has not been well explored. In this study, via Ca2+ doping with an optimized concentration of 25 mol% in the hydrothermal solution, irregular NaGdF4:Yb/Er submicrocrystals converted into highly uniform submicrorods. Meanwhile, an obvious enhancement of visible upconversion (UC) and near-infrared (NIR) downconversion (DC) emission were obtained, probably due to the improved morphology and lowering the local crystal field symmetry around the rare earth ions induced by Ca2+ doping. Furthermore, Ce3+ ions with an optimized concentration of 2 mol% were codoped to intentionally tailor the branching ratio through efficient energy transfer from Er3+ to Ce3+. As a result, the ∼1530 nm emission intensity of the NaGdF4: 25Ca/2Ce/20Yb/2Er submicrorods increased by about 6.4 times in comparison with the NaGdF4:20Yb/2Er counterpart.
研究领域:
材料科学
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光学工程
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纳米技术
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稀土化学
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光电子学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Ze-Dong Yu,Jing-Yi Cao,Hua-Long Li,Guang Yang,Wen-Xuan Zhao,Chuan-Zeng Wang,Shu-Hai Chen,Mark R.J. Elsegood,Carl Redshaw,Takehiko Yamato
In view of the widespread applications and urgent need for efficient blue emitting materials, the synthesis of such materials has seen renewed interest. In the present work, three alkyl chain-dependent blue emitting pyrene-based luminogens were synthesized and characterized. The experimental results show that these luminogens exhibited high photoluminescence efficiency both in solution (>86%) and in the solid state (>35%). Interestingly, 1,3,6,8-tetrakis (pentylphenyl)pyrene ( TPPy ), as a photoelectric functional material , was endowed with higher quantum yield (72%) and competitiveness due to a remarkable crystallization-induced emission enhancement (CIEE) property. More importantly, TPPy exhibits high sensitivity and selectivity for ortho -nitroaniline ( o -NA ) with low limit of detection (9.99 × 10 −8 M), which is mainly due to the distinctive odd-even effects of the terminal alkyl chain. The results demonstrate that this type of luminogen can potentially be utilized for practical applications in the field of contaminant or explosive detection as a sensitive and portable fluorimeter.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Qingming Huang
The preparation of high performance upconversion luminescence materials with stronger shortwave emissions is still a challenge. In this work, the feature of hexagon circles sublattice structure of tetragonal LiYF 4 was revealed, and the sublattice level energy clusters of 4 Yb 3+ -1Tm 3+ were constructed by the substitution of 70 mol% Yb 3+ for Y 3+ in tetragonal LiYF 4 matrix. The sensitizing ions concentration quenching was inhibited by the hexagon circles sublattice structure, and the upconversion luminescence was dramatically enhanced, especially, the UV band emission was enhanced about 20 times and the intensity ratio of UV to blue emissions was improved about 10 folds under the excitation power density of 0.230 W/cm 2 . Photon numbers of upconversion emissions obviously decreased with the increasing of sublattice level energy clusters that the upconversion process of three photons was changed to two steps of two photons process. The upconversion luminescence mechanism of sublattice energy cluster construction was system investigated. The material with high performance of UV and blue UC luminescence can be a well candidate for the applications of photodynamic therapy and photocatalytic, etc. The work may be an inspiration for high efficient UC luminescence materials design and preparation.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2022
·Vol. 16
·期 10
·2200091
·
IF 10.947
Tianyu Liu,Chenying Yang,Zhuping Fan,Xu Chen,Zeng Chen,Yirong Su,Hanbo Zhu,Fangling Sun,Tingming Jiang,Wenjuan Zhu,Weidong Shen,Jianjun He,Haiming Zhu,Xu Liu,Yang (Michael) Yang
Perovskite light-emitting diodes (PeLEDs) have attracted much attentions due to the superior optoelectronic properties such as pure spectrum, high photoluminescence quantum yield, tunable emission, and ease of fabrication. Though lots of progresses have been made on PeLEDs and optically pumped lasers, microcavity perovskite lasing device under electrical pumping remains extremely challenging. Microcavity perovskite LEDs can be considered as a step toward laser diode due to the common structure of resonant cavity. In this study, a new type of metal-dielectric microcavity PeLED is designed and fabricated by using 2.5 pairs of TiO 2 /SiO 2 distributed bragg reflector (DBR) and Al as cavity coplanar mirrors. A microcavity device with forward spectral full-width at half-maximum of 11.8 and 9.5 nm, under electrical and optical excitations, respectively, the directional forward emission within 30° is enhanced by 3 times compared to the control device without cavity is realized. To the best of the knowledge, this study demonstrates the narrowest spectrum for three-demisional PeLEDs so far, it helps to expand the color space in display applications and may also serve as a reference device for solution processed perovskite exciton–polariton electroluminescent devices and electrically driven vertical cavity surface emitting lasers due to the similar device structure and processing.
研究领域:
光学
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材料科学
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电子工程
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2149
·
IF 4.6
Zhe Chen,Zhuoyi Wang,Yihua Yuan,Bo Liu,Jiangbo Yu,Zhiwen Wei,Keming Yun
DNA self-assembled fluorescent nanoprobes have been developed for bio-imaging owing to their high resistance to enzyme degradation and great cellular uptake capacity. In this work, we designed a new Y-shaped DNA fluorescent nanoprobe (YFNP) with aggregation-induced emission (AIE) characteristic for microRNA imaging in living cells. With the modification of the AIE dye, the constructed YFNP had a relatively low background fluorescence. However, the YFNP could emit a strong fluorescence due to the generation of microRNA-triggered AIE effect in the presence of target microRNA. Based on the proposed target-triggered emission enhancement strategy, microRNA-21 was detected sensitively and specifically with a detection limit of 122.8 pM. The designed YFNP showed higher bio-stability and cell uptake than the single-stranded DNA fluorescent probe, which has been successfully applied for microRNA imaging in living cells. More importantly, the microRNA-triggered dendrimer structure could be formed after the recognition of target microRNA, achieving a reliable microRNA imaging with a high spatiotemporal resolution. We expect that the proposed YFNP will become a promising candidate for bio-sensing and bio-imaging.Keywords:DNA fluorescent nanoprobes;Y-shaped;aggregation-induced emission;microRNA;live-cell imaging
研究领域:
生物化学
·
分子生物学
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS A-PHYSICAL
·
2025
·
IF 4.9
Ziqiang Tian,Maoyuan Huang,Qi Zhong,Xiaomeng Gong,Jia Guo,Ruiqian Guo,Changchun Wang
The design and fabrication of photonic crystals with multiple optical states are significant and urgently desired. However, most conventional photonic crystals with scalable potential display only a single structural color mode, limiting their practical application. Herein, we successfully achieved a new type of dual-mode photonic crystal films through the co-assembly of polymer colloidal core@shell nanoparticles and InP@ZnS quantum dots at room temperature. The co-assembly process was completed with high efficiency by a powerful assembly technique called molecule-mediated shearing-induced assembly technique (MSAT). The obtained dual-mode photonic crystal films possessed two distinct optical states, including a structural color mode and a fluorescent color mode. The advantages of both photonic band gaps and fluorescence emission were synchronously integrated, exhibiting bright structural colors and vibrant fluorescent colors under sunlight irradiation and ultraviolet excitation, respectively. The switch of the two optical states was highly reversible and stable. Besides, we also found that the dual-mode photonic crystal films realized enhanced fluorescent emission from the slow photon effect, and the relationship between the fluorescence enhancement effect and order degrees of dual-mode PC films was studied. Finally, the dual-mode photonic crystal films were employed to design a visual coding-decoding system, and also as raw materials to produce anti-counterfeiting photonic paints. All the experiments provided a novel insight for achieving multiple optical states within a single system, creating opportunities for extending the application of photonic crystals in the realm of information storage, anti-counterfeiting, response materials, and pattern display.
研究领域:
光学材料
·
光子学
·
纳米技术
·
材料科学
·
荧光光谱学
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信息安全
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防伪技术
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2017
·
IF 4.857
Hongzhou Lian,Qingming Huang,Yeqing Chen,Kai Li,Sisi Liang,Mengmeng Shang,Manman Liu,Jun Lin
Narrow band red-emitting A2GeF6:Mn4+ (A = Na, K, Rb, Cs) phosphors were prepared through a two-step precipitation–cation exchange route using a K2MnF6 precursor as the Mn4+ source. The phase purity, morphology, and constituent were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectric spectroscopy (XPS), and electron paramagnetic resonance (EPR) examination. Optical properties were investigated by photoluminescence spectra (PL and PLE) and high-resolution PL. A temperature-dependent PL examination was performed to investigate the electron–phonon coupling emission mechanism of Mn4+ in these alkali fluorogermanates. The PL data show that both ordered distribution and appropriate distance between Mn4+ ions are propitious for enhancement of the emission intensity. A resonance emission enhancement (REE) mechanism has been proposed to explain the intensity increment among these products. These phosphors present bright red emission under blue light (467 nm) illumination, among which Cs2GeF6:0.03Mn4+ exhibits the most excellent optical properties with a quantum yield (QY) of 93%. A WLED (white light-emitting diode) fabricated with blend of commercial YAG:Ce3+ and this phosphor emits intense warm white light with low color temperature (CCT = 3385 K) and high color rendering index (Ra = 90.5), implying its potential application as red phosphor in WLEDs.
研究领域:
材料科学
·
光学
·
光子学
·
照明技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）